Aftermarket carburetor o-rings

[Luca]

I recently rebuilt my carbs.  I got the bowl/enrichener gaskets from the local dealership (diaphragms/floats/needles had already been replaced), but I couldn't bring myself to spend $3 a pop on some tiny little o rings from BMW.

I used Anton Largiader's site to size my o-rings.  Unfortunately his sizing of the main jet holder is a little bit off.  I would recommend a 2mm x 8mm o-ring for that application.  I had to scare something up out of a kit I had in the garage for those, which I wasn't happy about because it didn't list the rubber type or hardness (durometer rating).

Nevertheless, you can get enough O-rings to rebuild your carbs 20 times (not including throttle shafts) for about $20 including shipping.  I chose Buna-N o rings at 70 durometer.

Enrichener 1.5mm x 5mm
Idle jet/pilot screw 1.78 x 2.9mm
Main jet holder 2mm x 8mm

I purchased them from theoringstore.com.  I have no affiliation; they just have a good selection and the prices are reasonable.  Also, you know exactly what you're getting as far as rubber type, size, and hardness, which is important for this application.

[wilcom]

Enrichener 1.5mm x 5mm
Idle jet/pilot screw 1.78 x 2.9mm
Main jet holder 2mm x 8mm

I purchased them from theoringstore.com.

 Very good info, Luca. Thanks for posting

[BPT]

Yeah, thanks for doing the legwork and posting this Luca.  This is good to know.

[Barry]

I do much the same Luca. 

When i first bought the bike 14 years ago I found a couple of O ring kits, one metric and one imperial. Between the two I have O rings to fit everything. They are also standard Buna- N nitrile which seem to work well enough.

The one O ring I did buy as a specific spare part was the oil filter $2000 O ring which turned out to be a disappointment as is was supplied as a standard black 70 shore O ring rather than the the original soft white O ring which comes with proper filter kits.  I've never used it as won't compress easily enough to allow the filter cover to tighten up flush.

[mrclubike]

And then there is the much improved after market  Quad ring for the brake shaft